auto darkening greenhouse

Patented Automated Light Deprivation A TRUE BLACKOUT SYSTEM

Why Light Deprivation?

Whether it’s pulling tarps or utilizing cutting-edge automated curtain systems, the benefits of light deprivation (or light dep) cultivation are undeniable: it can increase harvests from one outdoor grow to at least four or five a year, it significantly cuts energy consumption and total cost of operation compared to indoor cultivation, and it’s ultimately more sustainable. Automated light deprivation greenhouses now leverage enough technology and equipment developed for indoor grow rooms (supplemental lights, ventilation, environmental controls, dehumidifiers, etc.) and use them to complement or augment the effects of outdoor growing. This allows light dep greenhouse growers to maintain optimal temperature, humidity, lighting, and the ability to guard against pests and mold to have a totally controlled environment.



Our system is not an afterthought or a product purchased from another manufacturer. It was specifically engineered in conjunction with our Sierra and Alpine Series greenhouses to promote easy assembly and functionality without sacrificing quality or design.

The patented automated system opens and closes a 3-layer, breathable blackout fabric within minutes. Using only premium grade materials including galvanized 2” x 2” square steel tubing for increased stability and marine grade lubricants, we ensure the proper functioning and complete blackout of our systems. The square tubing provides two flat surfaces to marry and create a true blackout system without the use of flimsy rubber gaskets. That, combined with our 4-corner roller assembly, fixed and leading edge (c-channel), and no-snag gutter system make our automated light deprivation system the best investment for your harvests and your business.

We have spared no expense in designing and manufacturing our systems so you, the grower, can have more time and confidence to harvest and prosper.



Four corner roller assembly

Our unique roller assembly is installed in all four corners for even weight distribution. When the system is opened or closed, the weight is evenly distributed to reduce friction and wear on the breathable blackout material.

C-Channel and fixed edge closure system

We designed a square tubing and C-channel closure system to provide a gasket-free, light tight seal. Most systems use aluminum extrusions and gaskets. Aluminum extrusions are weak and flimsy while gaskets are a maintenance issue. With our system, these issues are eliminated.

No Snag Gutter System

As opposed to the common use of ground cloth for the bottom of the curtain, we developed a snag-free metal gutter system. Our system has a supportive purlin along the length of the gutter to make it completely rigid which ensures smooth opening and closure of the curtain.

Patented automated light deprivation greenhouses delivering the advantages of indoor growing without the challenges of traditional greenhouses.


Growing crops in greenhouses is fast becoming a preferred norm in the agricultural community- Cultivation of Cannabis in a Green- house is also proven the way to go and is preferably for farmers and even many of the law enforcement officials across the country and in Northern California as well. As the these structures are lockable and can be controlled to eliminate odors. These greenhouses are called Hightunnels which are actually a high tech “cold frames” and not the traditional wood & glass greenhouse as they are considered “temporary structures” which can greatly aid agriculture operations. The USDA now encourages and even funds hightunnels for farmers growing conventional crops as these systems conserve water, power, and serve as a habitat for biological alternatives for pest control (such as ladybugs and lacewings) instead of chemical pesticides. These hightunnel systems may utilize natural ventilation and passive solar principals to enhance production and do not rely on electricity or heating fuels. Although more and more growers are using High Tech Hybrid technology that merges advanced digital electronic systems AND natural elements to produce High Quality Crops. Both High Tech and Low Tech Greenhouses (hightunnels) allow cultivators to limit production costs and benefit the environment by cutting down the carbon footprint of growing operations. Because of this, greenhouses have taken hold in both the conventional crop and cannabis industry. As cultivation expert Jorge Cervantes put it, “. a greenhouse is one of the best places to grow medicinal marijuana.” Cannabis growers see the same advantages of being able to control the environmental conditions of their plants as well as having an alternative to chemical farming- add to this the added necessity of physical security and biological isolation and these systems are the wave of the future in crop production. Across the country more and more square footage is utilized for growing non-psychoactive cannabis for medicine (High CBD) varieties and more recently, for recreational (THC) use, where it is allowed. Medicinal growers find with a greenhouse, they can eliminate cross pollination isolate the mostly CBD strains that have been medically proven to alleviate pain, nausea, seizures; spasticity, epilepsy and neuropathic pain. It seems likely that it is just a matter of time before limited personal grows of THC types in a secure structure as well as large-scale commercial (and TAXABLE) grows of the CBD types will be allowed. Being able to lock the doors and keep those who should not have access to cannabis (primarily children and pets) is another reason for growing in a greenhouse, as these structures can be hardened to control access. Several nearby county officials have expressed to their growing communities that they would prefer all grows be indoor (greenhouse) and even some counties with the most restrictive ‘rules’ still license secure greenhouse grows. While most greenhouse grows are in rural areas an on agricultural land, greenhouses are also suitable for urban settings- as they can be seen as compliant- if the grower can assure authorities that the structure can be secured have virtually little negative footprint You can also control the smell by using carbon exhaust filters and utilizing light proof covers to eliminate light pollution. Where it is currently allowed (or not)- more and more people are growing pot. Personal use is the main reason with commercial production close behind- with CBD varieties grown for commercial medicinal use showing great signs of promise. Bottom line is that virtually all the growers I meet tell me that just really enjoy growing the herb.

Hightunnels, Greenhouses & Hoop Houses

Personel and Medicinal Cannabis Growing Systems


DISCLAIMER – T hese systems are intended for legal purposes only under all applicable local, state, federal laws and ordinances. Grizzly Hill and our vendors do not encourage or otherwise advocate the illegal use, cultivation, manfacture, distribution or sales of illicit plants or controlled substances in any way.

Complete AUTOMATIC Light Depo System $2450 Complete!


GROUND MOUNT; (tarp extra)


The Systems Listed here are: KEEP IT SIMPLE- Our Basic AUTO System – Timer / Power Supply – This system consists of an AUTO or Manual Switching and Reset controls, an Intermatic Timer and a Waterproof 24 volt Power Supply- This Controller runs on 120 vac and controls the 24 vdc Dep Motors allowing for different opening & closing times – We also offer: An All SOLAR Version of the model shown below. that works with a 24 vdc Power Supply- from a Solar System.

COMPLETE AUTOMATION- The modified iGROW Greenhouse Controllers are a more technical system that can control not only the Light but all aspects of your growing system- The Modified IGROW system with an onboard power supply and 6 or MORE channels for control of other functions of your Greenhouse. Whether you choose a simple or more comprehensive Auto Light Deprivation System- these are upgradable and can be modified to accept new technology – FOR A FULL REVIEW OFTHE IGROW SYSTEMEM- CONTACT US!


This system is engineered to ensure a smooth & easy operation of our Telescoping Tubes and other quality Components for our Telescoping Tubes utilizing Teflon Slides and Self-Retracting Cable

Our Motors are top-quality 24 vdc, High-Torque (100 Nm), Waterproof, with Built-in Limit Switches and easy to adjust controls-

Over-The Top System Drawing

We provide Complete High Quality Kits for building both Cold Frames, Hightunnels and Commercial Greenhouses. These Kits are complete and include the Precision Bent Frames, State-of-the-Art Hardware & Software and a selection Greenhouse Coverings. They are easy to construct and offer an affordable Solution to Extending your Crop Production.

iGrow will also let you know how much energy your greenhouse is using- allowing you to adjust- to save money- You can also see which equipment is using the most energy.

OUR AUTO DEPO SYSTEM offers the capability of shortening your photoperiod to force blooming and bring your garden to harvest on a controlled schedule – using your own or a shared schedule that allows you to document your growing parameters and share with others- You can modify your schedule for different genetic strains and other conditions.


A LIGHT DEPRIVATION SYSTEM modifies the Photoperiod for Plants by controlling the amount of Light entering the Greenhouse and the length of these alternating Light /Dark Periods- This function is usually a Timed-Auto function or a manually controlled Systems range from simple Mechanical Tarping System to a Completely Automated Auto -Darkening Photoperiod Control Systems for Greenhouse Crops .

Daylength exerts profound effects on the growth and flowering of many plant species, and manipulation of daylength is essential for scheduling several greenhouse crops. The responses of plants to daylength may appear to be a perplexing subject, but it is easy to understand once some basic concepts are mastered. This article briefly reviews photoperiodism and photoperiod control systems for greenhouses. Photoperiod control is necessary for scheduling greenhouse crops such as mum, kalanchoe, Holiday cactus, and poinsettia. The latitude and species will determine whether shortening or lengthening of the daylength is needed. There are two types of photoperiod control systems used in commercial greenhouses: (1) using incandescent, fluorescent, or high-intensity discharge (HID) lamps during naturally short days (SD) to create artificial long days (LD); and (2) using opaque black cloth (or similar material) during naturally LD in order to create artificial SD.
Shortening the daylength (artificial SD). Plants are covered with an opaque material that reduces the light intensity. To be effective, the light intensity must be decreased to less than 2 ft-c under the material. In most operations, plants are covered at 4-5 pm and shade is removed at 7-8 am to provide an 8-hour day. A 4’ height is recommended between the top of cloth and the bench (bed) top to reduce heat buildup around plants; tall crops (such as cut mums) require more height. The material must be placed over the plants continuously (every evening) until the response is maximal. Several types of materials can be used to cover plants, and include the following: (1) black sateen cloth is a jet black woven cloth made from cotton or a cotton/polyester blend, and costs Vary (Call us) per square yard; (2) polyolefin sheeting is a woven material that is tear-resistant and waterproof, and costs ¯(Call US) 0 per square yard; and (3) 4-6 mil black/white plastic can be used but is not tear-resistant, and costs $0.27-0.41 per square yard. Tears and worn spots should be repaired, and overlaps of shading materials should be properly sealed to minimize light leakage. Occasional 24-hour skips in shading are not catastrophic, but flowering can be delayed. For mums, every day that shading is skipped delays flowering by one additional day. Failure to shade consistently may also cause irregular opening of flowers.

HIGHTUNNELS Growing crops in greenhouses is fast becoming a preferred norm in the agricultural community- Cultivation of Cannabis in a Green- house is also proven the way to go and is preferably ]]>